Intercell Frequency Offset Compensation for Frequency Domain Interference Cancellation and Equalization for Downlink Cellular Systems

1. A method for interference cancellation of interference components of a time domain signal in the frequency domain, comprising: receiving a time domain sequence; generating a plurality of overlapping time domain segments from the time domain sequence; performing a serving cell frequency compensation operation on the overlapping time domain segments to compensate for frequency offset associated with a serving cell; converting the plurality of overlapping time domain segments into a plurality of frequency domain segments; performing a first interference cell frequency offset compensation operation during an equalization phase of the interference cancellation; and performing a second interference cell frequency offset compensation operation during a reconstruction phase of the interference cancellation.

2. The method of claim 1 , wherein performing a serving cell frequency compensation operation comprises multiplying each time domain segment by a complex sinusoid with a frequency equal to the serving cell frequency offset.

3. The method of claim 1 , wherein the first interference cell frequency offset compensation operation comprises equalizing the frequency domain segments using equalizer taps that have been multiplied by a complex sinusoid with frequency equal to the difference between the serving cell frequency offset and the interference cell frequency offset.

4. The method of claim 1 , wherein the second interference cell frequency offset compensation operation comprises reconstructing the frequency domain segments using equalizer taps multiplied by a complex sinusoid with a frequency equal to the difference between the serving cell frequency offset and the interference cell frequency offset.

5. The method of claim 1 , further comprising: converting the frequency domain segments to time domain after performing the first operation; multiplying the time domain segments with a complex sinusoid having a frequency equal to the difference between the serving cell frequency offset and the interference cell frequency offset; and obtaining an estimated value of a transmitted signal using the time domain segments.

6. The method of claim 5 , further comprising converting the estimated value to frequency domain; and directly removing the interference components from the frequency domain segments.

7. The method of claim 1 , wherein the interference components comprise co-channel interference.

8. The method of claim 1 , wherein the interference components are due to a multipath fading channel.

9. A non-transitory computer-readable medium, comprising: at least one instruction for causing a computer to: receive a time domain sequence; generate a plurality of overlapping time domain segments from the time domain sequence; perform a serving cell frequency compensation operation on the overlapping time domain segments to compensate for frequency offset associated with a serving cell; convert the plurality of overlapping time domain segments into a plurality of frequency domain segments; perform a first interference cell frequency offset compensation operation during an equalization phase of the interference cancellation; and perform a second interference cell frequency offset compensation operation during a reconstruction phase of the interference cancellation.

10. An apparatus, comprising: means for receiving a time domain sequence; means for generating a plurality of overlapping time domain segments from the time domain sequence; means for performing a serving cell frequency compensation operation on the overlapping time domain segments to compensate for frequency offset associated with a serving cell; means for converting the plurality of overlapping time domain segments into a plurality of frequency domain segments; means for performing a first interference cell frequency offset compensation operation during an equalization phase of the interference cancellation; and means for performing a second interference cell frequency offset compensation operation during a reconstruction phase of the interference cancellation.

11. An apparatus for compensating for frequency offset for interference cancellation of interference components of a time domain signal in the frequency domain, comprising: at least one processor configured to: receive a time domain sequence; generate a plurality of overlapping time domain segments from the time domain sequence; perform a serving cell frequency compensation operation on the overlapping time domain segments to compensate for frequency offset associated with a serving cell; convert the plurality of overlapping time domain segments into a plurality of frequency domain segments; perform a first interference cell frequency offset compensation operation during an equalization phase of the interference cancellation; and perform a second interference cell frequency offset compensation operation during a reconstruction phase of the interference cancellation; and a memory coupled to the at least one processor.

12. The apparatus of claim 11 , wherein the processor is further configured to perform the serving cell frequency compensation operation by multiplying each time domain segment by a complex sinusoid with a frequency equal to the serving cell frequency offset.

13. The apparatus of claim 11 , wherein the processor is further configured to perform the first interference cell frequency offset compensation operation by equalizing the frequency domain segments using equalizer taps that have been multiplied by a complex sinusoid with a frequency equal to the difference between the serving cell frequency offset and the interference cell frequency offset.

14. The apparatus of claim 11 , wherein the processor is further configured to perform the second interference cell frequency offset compensation operation by reconstructing the frequency domain segments using equalizer taps that have been multiplied by a complex sinusoid with a frequency equal to the difference between the serving cell frequency offset and the interference cell frequency offset.

15. The apparatus of claim 11 , wherein the processor is further configured to: convert the frequency domain segments to time domain after performing the first operation; multiply the time domain segments with a complex sinusoid having a frequency equal to the difference between the serving cell frequency offset and the interference cell frequency offset; and obtain an estimated value for a transmitted signal using the time domain segments.

16. The apparatus of claim 15 , wherein the processor is further configured to: convert the estimated value for the time domain segments to the frequency domain; directly remove the interference components from the frequency domain segments.

17. The apparatus of claim 11 , wherein the interference components comprise co-channel interference.

18. The apparatus of claim 11 , wherein the interference components are due to a multipath fading channel.